GTV power supplies for safe and smart door control
Fire safety, access control and door control in a single, reliable 24 VDC power supply
- 24 VDC power supply and intelligent control in a single unit
- Fully backwards compatible with GTV and GTV-A
- 13 programmes (0 to 12) for a variety of door scenarios
GTV power supplies for safe and smart door control
Safe, fire-resistant doors that operate smoothly in everyday use and react correctly in the event of a fire or power cut — it all starts with the right power supply and control system. GTV power supplies provide fire safety, access control, evacuation safety and ease of use combined into a single solution. The result: demonstrable compliance, fewer different components in stock and simpler maintenance.
GTV power supplies deliver reliable 24 VDC door components — door magnets, electric door closers, electric locks, locking magnets and smoke vents — and control them based on signals from the building’s systems (fire alarm control panel, building management system, card reader or manual call point).
For installers, building managers and engineers, door functions often cut across several disciplines at once. With the new GTV-I Electroproject makes this combination clearer, more flexible and more reliable.
What’s new about the GTV-I?
The GTV-I is the new generation of GTV power supplies. Whereas a traditional power supply merely provides voltage, the GTV-I functions as intelligent link between the fire alarm control panel and door systems. Four points make all the difference:
- Fully backwards compatible with GTV and GTV-A. Replace existing power supplies without having to modify the cabling, door components or control system. This reduces the risks and costs associated with an upgrade.
- Maintenance-free backup via TX1 SuperCap. Overcomes power cuts without the need for a battery and therefore without the need for replacement maintenance — lower total cost of ownership.
- Intuitive diagnostics via LEDs and a load indicator. See at a glance whether an output is live, overloaded or switched off.
- Extensive I/O: 5 inputs and 2 power outputs. Space for BMC, GBS, card reader, timer and feedback on a single unit.
See also the news article:
“The new GTV-I power supply – intelligent, modular and ready for the future”.
What is a GTV power supply?
A GTV power supply is a power supply and control unit that supplies 24 VDC to building-integrated door components and controls them on the basis of signals from the building’s electrical system. Based on these signals, a door can be held open by a door magnet under normal circumstances, but will close automatically as soon as the fire alarm control panel sends a signal. In other applications, a door is unlocked specifically in the event of an emergency, or an electric lock is activated following authorisation by a card reader.
GTV power supplies are used in offices, hospitals, care homes, schools, car parks, hotels, logistics facilities and industrial settings — wherever safety, flow and control come together.
Applications of the GTV-I
The GTV-I covers a wide range of door scenarios. Here is a selection of its many applications.
1. Emergency exit door release (fail-safe)
A solenoid lock keeps the emergency door locked under power and de-energises in the event of a fire alarm or emergency release. The door is immediately released to allow evacuation, in accordance with safety requirements.
2. Closing sequence for double doors
Two independent outputs allow door A to close before door B (with an adjustable delay of 6 seconds), so that double fire doors do not collide with one another. In the event of a power cut, a TX1 provides a backup.
3. Integration with access control
During the day, a card reader unlocks the door; in the event of a fire alarm, all doors are immediately unlocked. A single system for both security and fire safety.
4. Control of smoke vents and fire dampers
The GTV-I not only powers doors, but also the solenoid clamps in smoke hatches and air ducts, which move to their safe position in the event of an emergency — at the same time as the door control system.
5. Connecting multiple power supplies (master/daisy chain)
A single alarm contact can unlock dozens of doors across several floors simultaneously, without having to control each power supply separately. Ideal for hospitals and large offices.
For a complete overview of all applications, download the application manual
GTV-I programmes (0 to 12)
The GTV-I features Programme 0 to 12. A single unit can therefore be used for multiple applications — which simplifies design, installation, stock management and maintenance.
No. | Programme | Tax | Core functionality | Typical application |
0 | Manual test company | I + II | Manual activation/deactivation, independent of inputs | System test, magnet check |
1 | Zone control | I + II | Simultaneous on/off on signal A/B/C or DK | 1 compartment or group, centrally controlled |
2 | Closing sequence for double doors | I + II | Simultaneous, delayed output (6s I–II) | Double doors, collision prevention |
3 | 2 independent zones | I, II | Independent on/off via separate inputs (A/C and B/C) | 2 compartments, separate logic |
4 | Area with enhanced security | I, II | Independent switching; II can only be switched off via B | Critical zone, selective shutdown |
5 | Zone control + reset | I + II | Same as 1, but a reset requires local DK operation | Safe resumption of operations following an alarm |
6 | Lock sequence + reset | I + II | Same as 2, but a reset requires local DK operation | Double door, inspection following an alarm |
7 | 2 zones + reset | I, II | Same as 3, but a reset requires local DK operation | Separate zones, safe return to use |
8 | Secure zone + reset | I, II | Same as 4, but a reset requires local DK operation | Secure areas, recommissioning |
9 | Peak current limitation (cascade) | I + II | Delayed activation (I immediate, II after 6s) | Flood prevention, smoke damper control |
10 | UPS Function Test Programme | I + II | Manual switching test of the UPS function | UPS backup simulation, maintenance |
11 | Non-preferential/preferential backup | I + II | I switches off immediately in the event of a power cut; II remains on until the backup is depleted | Selective UPS, load sharing |
12 | Sliding door + signalling system | I, II, 6 | I = door magnet, II = strobe, 6 = slow whoop, sequenced | Automated evacuation, alarm systems |
The product range: GTV-I 25, 100 and 250 + TX modules
The GTV-I range comprises three models designed for a variety of power ratings and applications:
- GTV-I 25 — for light-duty door applications.
- GTV-I 100 — for medium-duty installations.
- GTV-I 250 — for more complex installations with a greater number of connected components.
All models supply 24 VDC and control door components in fire safety, security and access control systems.
Back-up in the event of a power cut
- TX1 (SuperCap) — maintenance-free backup in the event of a power cut, without a battery.
- TX5 (battery) — longer standby time, up to around an hour, depending on usage and configuration.
What’s new compared to the GTV-A?
Are you already using a GTV-A? The comparison below shows what the GTV-I offers in addition.
Characteristic | GTV-A (current) | GTV-I (new) |
Programmes | 5 | 13 (programmes 0 to 12) |
Back-up in the event of a power cut | External backup unit (GTV-BU) | TX1 SuperCap (maintenance-free) or TX5 battery |
Diagnosis | Basic | LEDs + load indicator |
I/O | Standard | 5 inputs, 2 power outputs |
Alert | — | Flash + slow-whoop (programme 12) |
Compatibility | — | Backward compatible with GTV and GTV-A |
How do you choose the right GTV power supply?
The choice starts with the door’s function, followed by the signals, power requirements and backup requirements. Key selection questions:
- What door function needs to be implemented (keeping the door open and closing it in the event of a fire, or unlocking it in the event of an emergency)?
- Which components need to be powered and controlled, and how many?
- How much power is required?
- Is integration with a BMC, GBS or access control system required?
- Should the door(s) respond to multiple signals?
- Is a backup required in the event of a power cut (TX1 or TX5)?
- Is it a new build, an extension, a retrofit or a replacement?
Are you unsure about the right model or configuration? Book a no-obligation consultation — our specialists are happy to offer their input.
Retrofit or replacement
Because the GTV-I fully backwards compatible With existing GTV and GTV-A systems, you can modernise without having to replace the entire door power supply. Retrofitting is relevant when an existing power supply is technically obsolete, maintenance becomes more difficult, or when new building functions are required. Examples include the addition of access control, changes to fire safety requirements or integration with a building management system.
Wiring diagram for the GTV-I
Visual Please insert the wiring diagram from the application manual (page 25) here as an image.
Please note the following: DK (door knob/reset), inputs A/B/C/D/E (from BMC, GBS, reset, limit switches) and the optional backup/TX module.
Evidence from practice
Electroproject has been developing and manufacturing GTV power supplies in-house for over fifty years and uses them in places such as hospitals, where doors play a crucial role in compartmentalisation and escape routes. Take a look at our customer case studies in magnetism and security technology.
Frequently asked questions (FAQ)
A GTV power supply powers and controls electrical door components such as door magnets, electric door closers, electric locks, locking magnets and smoke vents. The power supply delivers 24 VDC and processes signals from other building systems.
The GTV-I is the new generation: 13 programmes (0 to 12) instead of 5, maintenance-free SuperCap backup, diagnostics via LEDs and a load indicator, and fully backwards compatible with the GTV and GTV-A.
No. GTV power supplies are widely used in fire safety systems, but also in conjunction with access control, security, smoke control, evacuation safety and building management.
Yes. In the event of a fire alarm, the GTV can close doors or, conversely, release or unlock them, depending on the selected application and configuration.
Yes. A GTV can receive signals from a building management system, so that door control is integrated with central monitoring and operation.
Programmes 0 to 12: from central zone control and closing sequence for double doors to peak current limitation, UPS functions and sliding door control with visual and audible alerts.
When a backup power supply for the door is required in the event of a mains power failure. The TX1 with SuperCap is maintenance-free; the TX5 with a battery provides a longer backup, up to approximately one hour, depending on the load and configuration.
Yes. The GTV-I is suitable for new installations as well as for upgrading, retrofitting and replacing existing GTV and GTV-A power supplies, as it is fully backwards compatible.
That depends on the application, the power required, the number of connected components and the integration with BMC, GBS or access control. Use the configurator or ask Electroproject for advice.
Contact us without obligation
Wondering what we can do for you? Then contact our specialist Ronald Olff without obligation.
Would you like some advice or to place an order straight away?
Would you like to be sure which GTV-I power supply is suitable for your door application? Our specialists will help you with the correct selection, configuration and application.
- We will contact you within 48 hours on working days
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